This report summarizes all water quality data collected
at Site POR-40, Portage River in the Portage River at Indian Lake Basin of the Portage River Sub-Watershed, which is part of the larger
St. Joseph River Watershed. (see map to the right)

Water sampling and measurements are conducted by Environmental
Health Bureau staff.

Portage River at Indian Lake (State of Michigan Basin ID #: 34 46)

Portage River

POR-40

North side of East 'OP' Avenue, between South 30th Street and South 31st Street

Pavilion Township (10)

Site Code: POR-40, Portage River

Sample

Sample

E. coli Bacteria

Water Temperature

Dissolved Oxygen

pH

Conductivity

TDS

Turbidity

Date

Time

(MPN)

(degrees F)

mg/L

% Saturation

(units)

(mS / cm)

(g / L)

(NTU)

10/21/2009

13:10

137.4

49.9

12.5

110.6%

8.60

0.538

0.4

2.0

06/30/2009

11:50

547.5

62.8

N/A

N/A

8.41

0.508

0.3

3.6

05/05/2009

12:15

80.9

N/A

N/A

N/A

N/A

N/A

N/A

3.3

12/29/2008

11:20

248.9

32.4

14.8

101.8%

7.99

0.398

0.3

3.5

10/29/2008

09:50

81.6

40.4

11.2

87.4%

8.01

0.509

0.3

2.7

09/18/2008

07:55

248.1

61.4

5.8

58.7%

7.51

0.299

0.2

3.0

07/09/2008

10:25

488.4

71.0

6.6

75.0%

7.99

0.420

0.3

1.8

04/29/2008

10:50

135.4

51.4

10.5

95.1%

8.54

0.493

0.3

2.5

04/01/2008

11:26

58.3

46.4

9.5

80.3%

7.92

0.426

0.3

2.8

03/04/2008

11:30

52.9

35.2

13.6

97.5%

7.82

0.466

0.3

2.6

02/05/2008

11:46

108.6

36.7

11.9

87.0%

7.92

0.490

0.3

2.8

01/07/2008

11:55

124.6

41.4

12.5

98.3%

7.46

0.523

0.3

2.8

08/30/2007

11:55

547.5

69.8

7.2

81.2%

8.10

0.502

0.3

2.0

07/12/2007

08:45

1,986.3

63.7

6.6

69.8%

8.01

0.513

0.3

1.5

05/29/2007

10:20

152.9

71.1

8.3

94.0%

7.90

0.476

0.3

2.8

04/24/2007

10:45

118.7

59.2

8.8

87.2%

8.31

0.485

0.3

2.6

01/11/2007

10:05

63.8

35.2

12.2

87.5%

8.08

0.443

0.3

2.5

10/17/2006

10:20

686.7

49.3

8.9

78.0%

7.95

0.504

0.3

N/A

09/07/2006

09:15

866.4

59.9

10.4

104.0%

8.18

0.513

0.3

2.6

06/22/2006

09:48

920.8

70.4

7.6

85.7%

8.14

0.480

0.3

N/A

04/18/2006

09:15

206.4

52.7

4.2

39.8%

8.56

0.530

0.3

5.5

03/16/2006

08:50

88.0

41.0

6.5

52.1%

8.20

0.421

0.3

14.8

11/17/2005

10:15

95.9

35.4

11.5

84.1%

8.40

0.566

0.4

6.4

10/11/2005

12:30

501.2

53.5

8.5

81.0%

8.25

0.398

0.2

5.0

09/01/2005

10:05

980.4

63.6

5.6

58.3%

8.09

0.533

0.3

7.4

07/14/2005

10:35

1,046.2

72.9

6.9

81.9%

8.05

0.471

0.3

3.1

05/12/2005

08:55

410.6

57.0

8.0

79.7%

7.89

0.499

0.3

10.6

03/31/2005

14:55

29.2

N/A

N/A

N/A

N/A

N/A

N/A

N/A

03/03/2005

11:50

17.3

32.6

11.2

79.7%

7.63

0.521

0.3

6.5

10/19/2004

13:20

135.4

46.7

10.1

86.9%

8.13

0.503

0.3

2.2

08/13/2004

14:15

275.5

64.5

8.7

94.3%

8.14

0.477

0.3

1.4

07/09/2004

13:40

365.4

68.8

8.1

91.8%

7.84

0.445

0.3

2.4

06/03/2004

12:20

206.4

61.6

7.2

75.1%

7.59

0.421

0.3

3.7

05/13/2004

14:21

344.8

69.4

5.6

64.1%

7.44

0.327

0.2

8.5

04/07/2004

12:32

44.8

47.1

10.6

93.3%

8.15

0.448

0.3

3.9

03/17/2004

13:59

9.7

39.6

11.1

87.9%

7.97

0.450

0.3

7.7

02/25/2004

12:00

39.9

33.4

11.5

88.3%

8.15

0.528

0.3

11.8

02/04/2004

12:00

12.1

32.3

12.3

87.2%

7.96

0.567

0.4

5.3

01/14/2004

11:26

68.3

32.1

11.1

77.7%

7.95

0.529

0.3

2.4

12/11/2003

13:28

104.6

37.5

16.2

121.6%

8.12

0.480

0.3

3.8

11/19/2003

14:44

866.4

48.7

10.5

90.8%

8.22

0.426

0.3

5.2

10/29/2003

12:50

191.8

43.3

10.9

89.8%

9.05

0.490

0.3

2.8

10/08/2003

14:13

307.6

57.1

9.3

92.1%

8.67

0.461

0.3

2.6

09/19/2003

12:50

770.1

63.0

7.5

79.5%

8.59

0.477

0.3

4.5

08/07/2003

12:45

248.9

72.1

10.6

125.7%

8.66

0.440

0.3

7.9

07/24/2003

10:50

727.0

64.9

9.4

102.5%

8.58

0.451

0.3

5.8

07/10/2003

11:20

1,413.6

72.9

7.5

90.3%

8.30

0.414

0.3

10.3

06/26/2003

11:35

579.4

71.1

7.2

83.8%

8.23

0.458

0.3

3.8

06/12/2003

12:12

313.0

64.7

7.4

81.7%

8.11

0.436

0.3

N/A

05/29/2003

13:14

218.7

N/A

N/A

N/A

N/A

N/A

N/A

N/A

05/09/2003

11:41

1,299.7

58.8

7.8

78.9%

7.82

0.474

0.3

7.3

03/19/2003

12:10

30.1

34.8

12.8

101.9%

7.29

0.430

0.3

N/A

01/22/2003

14:45

46.4

N/A

N/A

N/A

N/A

N/A

N/A

N/A

01/15/2003

14:40

35.0

N/A

N/A

N/A

N/A

N/A

N/A

N/A

01/08/2003

14:45

68.9

N/A

N/A

N/A

N/A

N/A

N/A

N/A

12/18/2002

10:25

178.5

N/A

N/A

N/A

N/A

N/A

N/A

N/A

12/12/2002

13:20

57.3

N/A

N/A

N/A

N/A

N/A

N/A

N/A

12/04/2002

13:50

64.4

N/A

N/A

N/A

N/A

N/A

N/A

N/A

11/13/2002

11:25

75.9

N/A

N/A

N/A

N/A

N/A

N/A

N/A

10/23/2002

12:25

131.4

N/A

N/A

N/A

N/A

N/A

N/A

N/A

10/09/2002

12:50

920.8

N/A

N/A

N/A

N/A

N/A

N/A

N/A

09/25/2002

12:45

2,419.2

N/A

N/A

N/A

N/A

N/A

N/A

N/A

09/11/2002

13:50

1,553.1

N/A

N/A

N/A

N/A

N/A

N/A

N/A

08/28/2002

13:30

1,553.1

N/A

N/A

N/A

N/A

N/A

N/A

N/A

08/14/2002

13:20

2,419.2

N/A

N/A

N/A

N/A

N/A

N/A

N/A

07/31/2002

13:45

2,419.2

N/A

N/A

N/A

N/A

N/A

N/A

N/A

07/17/2002

14:50

920.8

N/A

N/A

N/A

N/A

N/A

N/A

N/A

06/19/2002

14:20

478.6

N/A

N/A

N/A

N/A

N/A

N/A

N/A

06/05/2002

13:30

396.8

N/A

N/A

N/A

N/A

N/A

N/A

N/A

05/22/2002

12:50

214.2

N/A

N/A

N/A

N/A

N/A

N/A

N/A

05/01/2002

14:25

62.0

N/A

N/A

N/A

N/A

N/A

N/A

N/A

09/26/2001

09:53

435.2

56.2

N/A

N/A

N/A

N/A

N/A

N/A

09/19/2001

09:50

1,553.1

61.3

N/A

N/A

N/A

N/A

N/A

N/A

08/30/2001

10:29

547.5

62.3

N/A

N/A

N/A

N/A

N/A

N/A

08/14/2001

09:59

980.4

65.0

N/A

N/A

N/A

N/A

N/A

N/A

08/01/2001

09:54

613.1

73.1

N/A

N/A

N/A

N/A

N/A

N/A

07/18/2001

10:24

547.5

68.0

N/A

N/A

N/A

N/A

N/A

N/A

07/03/2001

09:53

770.1

70.0

N/A

N/A

N/A

N/A

N/A

N/A

06/20/2001

11:53

396.8

63.0

N/A

N/A

N/A

N/A

N/A

N/A

06/06/2001

12:33

1,119.9

N/A

N/A

N/A

N/A

N/A

N/A

N/A

05/23/2001

12:00

209.8

61.0

N/A

N/A

N/A

N/A

N/A

N/A

05/09/2001

12:02

328.2

66.6

N/A

N/A

N/A

N/A

N/A

N/A

SummaryStatistics

Count

82

59

48

48

49

49

49

46

Average

501.5

55.0

9.5

85.9%

8.10

0.471

0.3

4.6

Minumum

9.7

32.1

4.2

39.8%

7.29

0.299

0.2

1.4

Maximum

2,419.2

73.1

16.2

125.7%

9.05

0.567

0.4

14.8

Above represents the summary statistics of ambient water quality conditions and below is a summary of E. coli bacteria results for POR-40 (Portage River) between May 2001 and October 2009. This site is located in Section Number 10 of Pavilion Township, North side of East 'OP' Avenue, between South 30th Street and South 31st Street.

40 out of 82 water sample results exceeded 300 bacteria colonies per 100 ml of water.

16 out of 82 water sample results were between 130 and 299 bacteria colonies per 100 ml of water.

26 out of 82 water sample results were less than 130 bacteria colonies per 100 ml of water.